Just created a page on Facebook / Google+, but don't want to spend time managing it? You can get another user and/or a social media agency to do the work for you. All you need to do is make them admin of your page and they can begin work on it. This presentation will show you how to add an admin to your Facebook and G+ page.
Facebook - Slide 3 to 10
Google+ - Slide 12 to 23